Analytical results for capacity improvements in CDMA

Author

Liberti, Joseph C., Jr. ; Rappaport, Theodore S.

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

43

Issue

3

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

680

Lastpage

690

Abstract

Examines the performance enhancements that can be achieved by employing spatial filtering in code division multiple access (CDMA) cellular radio systems. The goal is to estimate what improvements are possible using narrow-beam adaptive antenna techniques, assuming that adaptive algorithms and the associated hardware to implement these systems can be realized. Simulations and analytical results are presented which demonstrate that steerable direction antennas at the base station can dramatically improve the reverse channel performance of multicell mobile radio systems, and new analytical techniques for characterizing mobile radio systems which employ frequency reuse are described using the wedge-cell geometry of Rappaport and Milstein (1992). The authors also discuss the effects of using directional antennas at the portable unit. Throughout the paper the authors use phased arrays and steerable, fixed pattern antennas to approximate the performance of adaptive antennas in multipath-free environments

Keywords

antenna phased arrays; antenna radiation patterns; cellular radio; code division multiple access; directive antennas; filtering and prediction theory; frequency allocation; mobile antennas; mobile radio systems; radio stations; spatial filters; telecommunication channels; CDMA; adaptive algorithms; base station; capacity improvements; code division multiple access; directional antennas; frequency reuse; multicell mobile radio systems; multipath-free environments; narrow-beam adaptive antenna techniques; performance enhancements; phased arrays; portable units; spatial filtering; steerable direction antennas; steerable fixed pattern antennas; wedge-cell geometry; Adaptive algorithm; Adaptive arrays; Filtering; Hardware; Land mobile radio; Land mobile radio cellular systems; Multiaccess communication; Performance analysis; Phased arrays; Solid modeling;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.312781

Filename

312781